Having enjoyed an incredible debut campaign at Juventus, Massimiliano Allegri rightly received much praise for his stewardship of the Bianconeri. A domestic double—only the third in the club’s history—was a remarkable achievement, while guiding the team to their first Champions League final in over a decade ensured the coach was widely lauded.

However, almost every time Allegri was given a compliment, it came with the caveat that he had inherited an incredible squad who were...